Mandrake 8.0 with postfix

[qmail]

Q1.) I am setuping with Mandrake 8.0 kernal 2.4.3, how can I remove all
postfix?
Q2.) Should I stop all the pop3 and IMAP service in Xinetd?
Q3.) I should use courier-imap and qmail-pop3?
Q4.) I have many existing email account with user name like
"[EMAIL PROTECTED]" is it ok?
Q5.) Is it I should install dot-forward package b4 install qmail? my
.forward file don't work,
how to check what error by./instcheck?

Thanks a lot!
Qmail user